Paragraph Number

70

The semispherical seat 140 and semispherical rim 222 may cooperate to enable the screw 302 to pivot within the screw opening 106 within a range of motion. For example, the screw 302 may pivot within a range of motion ranging between approximately 45 degrees and approximately -45 degrees and the head feature 107 and lock feature 105 can engage and maintain engagement with each other with the rotatable structure 112 in a locked orientation. FIGs. 3B-3D illustrate examples of a screw 302 in three different orientations within the range of motion. FIG. 3B illustrates a screw 302 having its longitudinal axis oriented approximately 45 degrees from normal relative to the rotatable structure 112. FIG. 3C illustrates a screw 302 having its longitudinal axis oriented approximately 0 degrees from normal relative to the rotatable structure 112. FIG. 3D illustrates a screw 302 having its longitudinal axis oriented approximately -45 degrees from normal relative to the rotatable structure 112.

Added by DJM 5 2021